The art of Mapping

Some of the most enjoyable books I read have maps in them. Usually not more than 2 pages, tucked just inside the front cover.
I always refer to them several times in the course of reading the book. They are a great help when reading of new worlds or kingdoms etc.
I have played around several maps for my world where my stories are located.
This almost seems like a must as I start to write.
I don't draw well but can do well enough for me.
I even bought a small sketch book to do maps and layouts of towns and such.
I know I will never use them in the book when it publishes but they are invaluable as I create.